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Finding the Fourth Proportional to 758.79, 1,137.65 and 485.01

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Solution

The fourth proportional to 758.79, 1,137.65 and 485.01 is: 727.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.79 : 1,137.65 = 485.01 : x
  2. Step 2: Convert to fraction form
    758.79/1,137.65 = 485.01/x
  3. Step 3: Cross multiply
    758.79x = 1,137.65 × 485.01
  4. Step 4: Simplify right side
    758.79x = 551,769.20
  5. Step 5: Solve for x
    x = 551,769.20/758.79
  6. Step 6: Final answer
    x = 727.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.